Spawn planes around a circle?
Since you want to create this procedurally you can use modifiers. For this method you will need a curve. 


Add a curve, I will use a circle, Shift A -> Curve -> Circle
Modify the curve to your liking


Select the leaf object and add an array modifier


Fit Type: Curve
Curve: the curve we just created

Add Curve modifier to the same leaf object


Object: the curve we just created
Deformation Axis: sometime based on the orientation of the curve and leaf object you need to chose another one



Note that if for some reason steps 3 or 4 do not work you might have to apply the scale for the leaf and curve object. Ctrl L





example file